add changelog

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/ChangeLog.d/asn1-missing-guard-in-rsa.txt b/ChangeLog.d/asn1-missing-guard-in-rsa.txt
new file mode 100644
index 0000000..613bdc5
--- /dev/null
+++ b/ChangeLog.d/asn1-missing-guard-in-rsa.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * MBEDTLS_ASN1_PARSE_C and MBEDTLS_ASN1_WRITE_C is automatically enabled
+     as soon as MBEDTLS_RSA_C is enabled. Fixes #9041.